Table 3.

Hind foot injuries related to growth

Diagnosis	Presentation	Clinical findings	Radiology
Os trigonum	Young athletes with posterolateral ankle pain; worse with tiptoe walking	Posterolateral ankle pain that is reproducible on palpation and active or passive plantar flexion	Radiograph: an ossicle is seen posterior to the talus, between the calcaneus and distal tibia
Talocalcaneal coalition	Pain increases with activity; often a history of lateral ankle sprains	Examination shows decreased hind foot motion; rigid varus and absence of heel varus on tiptoe	CT: union of tarsal bones; four-corner syndrome

Abbreviation: CT, computed tomography.